Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96defd008fa86b2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 11:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cda8b927844d3c84b7ec864b68ee809 SHA-1: 3b75c51526d170296b214418e29e6f1ec8c0baa9 SHA-256: d96defd008fa86b2f9d3349a18d03a1ce2ac1113efa60b8400eb571686235a55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=how+to+take+screenshot+when+blocked PDF link annotation
    • https://imaggu.com/ci/userfiles/files/19125811295.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/23908523720.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba81cf554---nepudukarusowefat.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/kupitakanobonetanodenol.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ninegewa.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/15198973222.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/39517439995.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dqunj0nt0vuj6969m0d4dl4mpe/kekuriwuzipapulipasij.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/31546875689.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/77168788108.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145386bb9fe8---95135169798.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/kerasodelorariji.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c1f8ccb5---letesoxikazotu.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/goxudonet.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/4235163499.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630742369.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/kudotizapamadaruwisuzib.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zuxezegegijatim.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/basadufijijidemosewi.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/ziwibitejat.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/87679826236.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/82580803302.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 17900 bytes
SHA-256: b40987c11ef68ae9b5051702a621d53cf0af0fece54e8a781d563f0c64355997
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10684 bytes
SHA-256: 092e77c02b004c29c6a1495586a75659b3da8af5b49e22398ab2df447712a109
font_02_sfnt_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1